[llvm-branch-commits] [HWASan] [compiler-rt] Add non_negative_pointers option to HWASan alloc (PR #191089)

[Florian Mayer via llvm-branch-commits]

https://github.com/fmayer created https://github.com/llvm/llvm-project/pull/191089

This makes sure the allocator does not use the top bit of
the pointer. This is useful when HWASan is used in combination with
signed-integer-overflow detection. Some code uses arithmetic on intptr_t
that overflows for sufficiently large pointers.